1 /* See LICENSE file for license details. */
2 #define _XOPEN_SOURCE 500
16 #include <sys/types.h>
17 #include <X11/extensions/Xrandr.h>
18 #include <X11/keysym.h>
20 #include <X11/Xutil.h>
40 unsigned long colors[NUMCOLS];
50 die(const char *errstr, ...)
55 vfprintf(stderr, errstr, ap);
62 #include <linux/oom.h>
68 const char oomfile[] = "/proc/self/oom_score_adj";
70 if (!(f = fopen(oomfile, "w"))) {
73 die("slock: fopen %s: %s\n", oomfile, strerror(errno));
75 fprintf(f, "%d", OOM_SCORE_ADJ_MIN);
78 die("slock: unable to disable OOM killer. "
79 "suid or sgid set?\n");
81 die("slock: fclose %s: %s\n", oomfile,
93 /* Check if the current user has a password entry */
95 if (!(pw = getpwuid(getuid()))) {
97 die("slock: getpwuid: %s\n", strerror(errno));
99 die("slock: cannot retrieve password entry\n");
101 hash = pw->pw_passwd;
104 if (hash[0] == 'x' && hash[1] == '\0') {
106 if (!(sp = getspnam(getenv("USER"))))
107 die("slock: getspnam: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
111 if (hash[0] == '*' && hash[1] == '\0') {
113 if (!(pw = getpwnam_shadow(getenv("USER"))))
114 die("slock: getpwnam_shadow: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
115 hash = pw->pw_passwd;
117 die("slock: getpwuid: cannot retrieve shadow entry (make sure to suid or sgid slock)\n");
118 #endif /* __OpenBSD__ */
120 #endif /* HAVE_SHADOW_H */
126 readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
129 char buf[32], passwd[256], *inputhash;
130 int num, screen, running, failure;
131 unsigned int len, color;
134 static int oldc = INIT;
140 /* As "slock" stands for "Simple X display locker", the DPMS settings
141 * had been removed and you can set it with "xset" or some other
142 * utility. This way the user can easily set a customized DPMS
144 while (running && !XNextEvent(dpy, &ev)) {
145 if (ev.type == KeyPress) {
146 explicit_bzero(&buf, sizeof(buf));
147 num = XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
148 if (IsKeypadKey(ksym)) {
149 if (ksym == XK_KP_Enter)
151 else if (ksym >= XK_KP_0 && ksym <= XK_KP_9)
152 ksym = (ksym - XK_KP_0) + XK_0;
154 if (IsFunctionKey(ksym) ||
156 IsMiscFunctionKey(ksym) ||
158 IsPrivateKeypadKey(ksym))
164 if (!(inputhash = crypt(passwd, hash)))
165 fprintf(stderr, "slock: crypt: %s\n", strerror(errno));
167 running = !!strcmp(inputhash, hash);
172 explicit_bzero(&passwd, sizeof(passwd));
176 explicit_bzero(&passwd, sizeof(passwd));
184 if (num && !iscntrl((int)buf[0]) && (len + num < sizeof(passwd))) {
185 memcpy(passwd + len, buf, num);
190 color = len ? INPUT : (failure || failonclear ? FAILED : INIT);
191 if (running && oldc != color) {
192 for (screen = 0; screen < nscreens; screen++) {
193 XSetWindowBackground(dpy, locks[screen]->win, locks[screen]->colors[color]);
194 XClearWindow(dpy, locks[screen]->win);
198 } else if (rr->active && ev.type == rr->evbase + RRScreenChangeNotify) {
199 XRRScreenChangeNotifyEvent *rre = (XRRScreenChangeNotifyEvent*)&ev;
200 for (screen = 0; screen < nscreens; screen++) {
201 if (locks[screen]->win == rre->window) {
202 XResizeWindow(dpy, locks[screen]->win, rre->width, rre->height);
203 XClearWindow(dpy, locks[screen]->win);
206 } else for (screen = 0; screen < nscreens; screen++)
207 XRaiseWindow(dpy, locks[screen]->win);
212 lockscreen(Display *dpy, struct xrandr *rr, int screen)
214 char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
215 int i, ptgrab, kbgrab;
218 XSetWindowAttributes wa;
221 if (dpy == NULL || screen < 0 || !(lock = malloc(sizeof(struct lock))))
224 lock->screen = screen;
225 lock->root = RootWindow(dpy, lock->screen);
227 for (i = 0; i < NUMCOLS; i++) {
228 XAllocNamedColor(dpy, DefaultColormap(dpy, lock->screen), colorname[i], &color, &dummy);
229 lock->colors[i] = color.pixel;
233 wa.override_redirect = 1;
234 wa.background_pixel = lock->colors[INIT];
235 lock->win = XCreateWindow(dpy, lock->root, 0, 0, DisplayWidth(dpy, lock->screen), DisplayHeight(dpy, lock->screen),
236 0, DefaultDepth(dpy, lock->screen), CopyFromParent,
237 DefaultVisual(dpy, lock->screen), CWOverrideRedirect | CWBackPixel, &wa);
238 lock->pmap = XCreateBitmapFromData(dpy, lock->win, curs, 8, 8);
239 invisible = XCreatePixmapCursor(dpy, lock->pmap, lock->pmap, &color, &color, 0, 0);
240 XDefineCursor(dpy, lock->win, invisible);
242 /* Try to grab mouse pointer *and* keyboard for 600ms, else fail the lock */
243 for (i = 0, ptgrab = kbgrab = -1; i < 6; i++) {
244 if (ptgrab != GrabSuccess) {
245 ptgrab = XGrabPointer(dpy, lock->root, False,
246 ButtonPressMask | ButtonReleaseMask |
247 PointerMotionMask, GrabModeAsync,
248 GrabModeAsync, None, invisible, CurrentTime);
250 if (kbgrab != GrabSuccess) {
251 kbgrab = XGrabKeyboard(dpy, lock->root, True,
252 GrabModeAsync, GrabModeAsync, CurrentTime);
255 /* input is grabbed: we can lock the screen */
256 if (ptgrab == GrabSuccess && kbgrab == GrabSuccess) {
257 XMapRaised(dpy, lock->win);
259 XRRSelectInput(dpy, lock->win, RRScreenChangeNotifyMask);
261 XSelectInput(dpy, lock->root, SubstructureNotifyMask);
265 /* retry on AlreadyGrabbed but fail on other errors */
266 if ((ptgrab != AlreadyGrabbed && ptgrab != GrabSuccess) ||
267 (kbgrab != AlreadyGrabbed && kbgrab != GrabSuccess))
273 /* we couldn't grab all input: fail out */
274 if (ptgrab != GrabSuccess)
275 fprintf(stderr, "slock: unable to grab mouse pointer for screen %d\n", screen);
276 if (kbgrab != GrabSuccess)
277 fprintf(stderr, "slock: unable to grab keyboard for screen %d\n", screen);
284 die("usage: slock [-v] [cmd [arg ...]]\n");
288 main(int argc, char **argv) {
297 int s, nlocks, nscreens;
301 fprintf(stderr, "slock-"VERSION"\n");
307 /* validate drop-user and -group */
309 if (!(pwd = getpwnam(user)))
310 die("slock: getpwnam %s: %s\n", user, errno ?
311 strerror(errno) : "user entry not found");
314 if (!(grp = getgrnam(group)))
315 die("slock: getgrnam %s: %s\n", group, errno ?
316 strerror(errno) : "group entry not found");
324 if (strlen(hash) < 2)
325 die("slock: failed to get user password hash.\n");
327 if (!(dpy = XOpenDisplay(NULL)))
328 die("slock: cannot open display\n");
330 /* drop privileges */
331 if (setgroups(0, NULL) < 0)
332 die("slock: setgroups: %s\n", strerror(errno));
333 if (setgid(dgid) < 0)
334 die("slock: setgid: %s\n", strerror(errno));
335 if (setuid(duid) < 0)
336 die("slock: setuid: %s\n", strerror(errno));
338 /* check for Xrandr support */
339 rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
341 /* get number of screens in display "dpy" and blank them */
342 nscreens = ScreenCount(dpy);
343 if (!(locks = calloc(nscreens, sizeof(struct lock *))))
344 die("slock: out of memory\n");
345 for (nlocks = 0, s = 0; s < nscreens; s++) {
346 if ((locks[s] = lockscreen(dpy, &rr, s)) != NULL)
353 /* did we manage to lock everything? */
354 if (nlocks != nscreens)
357 /* run post-lock command */
361 die("slock: fork failed: %s\n", strerror(errno));
363 if (close(ConnectionNumber(dpy)) < 0)
364 die("slock: close: %s\n", strerror(errno));
365 execvp(argv[0], argv);
366 fprintf(stderr, "slock: execvp %s: %s\n", argv[0],
372 /* everything is now blank. Wait for the correct password */
373 readpw(dpy, &rr, locks, nscreens, hash);